I used to snack too after stressful days, or even out of sheer boredom. Now when I start feeling the cravings I grab a bottle of water. If that doesn't do the trick I go for a walk. If I'm not around the food I don't need then I won't find myself subconsciously putting it in my mouth.
Not to mention that a good walk is a great way to burn some calories, and the time alone can give you a chance to think about what was causing you the stress in the first place.
I can fully understand the stress of being miles away from your loved ones therefore feeling impotent to help. I now live in Ohio as a nurse while my aging parent's remain in Missouri. It kills me when I hear, usually weeks/months after the fact that one of them has fallen or needed some form of medical care.
Sometimes you just have to recite the Serenity prayer:
God, grant me the serenity
To accept the things I cannot change;
Courage to change the things I can;
And wisdom to know the difference.
I didn't attend the funeral, but I did send a nice letter stating my approval. -Mark Twain